Optical lens

Abstract

The invention provides an optical lens. The optical lens comprises a lens barrel, a lens group and a spacing element group, wherein the lens group and the spacing element group are assembled in the lens barrel; the maximum height L of the lens barrel and the sum sigma AT of air intervals of any two adjacent lenses in the lens group on an optical axis meet the following condition: L / sigma AT is greater than or equal to 2.53 and less than or equal to 3.12; the effective focal length f2 of the second lens and the air interval T12 between the first lens and the second lens on the optical axis meet the condition that f2 / T12 is greater than or equal to-19.89 and less than or equal to-16.02; the inner diameter d1m of the image side surface of the first spacing element and the spacing distance EP12 between the image side surface of the first spacing element and the object side surface of the second spacing element in the optical axis direction meet the following condition: d1m / EP12 is greater than or equal to 4.06 and less than or equal to 7.0. According to the invention, the problem that in the prior art, the edge field of view is dispersed and intensified in order to meet the miniaturization requirement of an optical lens is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to an optical lens. Background Art

[0002] With the continuous development of electronic products, users' requirements for electronic products are constantly increasing, requiring electronic products to be lighter and thinner. The optical lenses mounted on electronic products are also gradually developing in the direction of lighter and thinner. The air gap between the lenses of the optical lens is small. When the incident angle of the light in the edge field of view is large, the light will be deflected at a large angle. The defocus offset and scattering of the light will cause uneven sensitivity, making the sensitivity distribution of the entire optical lens unreasonable, thereby increasing the sensitivity of the entire imaging system, resulting in increased discreteness of the edge field of view, and affecting the quality of imaging.

[0003] That is to say, in the prior art, the optical lens has the problem of increasing edge field discreteness in order to meet the demand for miniaturization. Summary of the invention

[0004] The main purpose of the present invention is to provide an optical lens to solve the problem in the prior art that the edge field of view is more discrete due to the need for miniaturization of the optical lens.

[0005] In order to achieve the above-mentioned object, according to one aspect of the present invention, an optical lens is provided, comprising a lens barrel, a lens group and a spacer element group assembled in the lens barrel, wherein the lens group is composed of eight lenses, and the lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence from the object side to the image side along the optical axis direction, wherein the second lens has a negative optical power; and the spacer element group includes at least a first spacer element and a second spacer element, wherein the first spacer element is located between the first lens and the second lens and is in contact with the image side surface portion of the first lens, and the second spacer element is located between the second lens and the third lens. The maximum height L of the lens barrel and the sum of the air spacings ∑AT between any two adjacent lenses in the lens group on the optical axis satisfy the following: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air spacing T12 between the first lens and the second lens on the optical axis satisfy the following: -19.89≤f2 / T12≤-16.02; the inner diameter d1m of the image side surface of the first spacing element and the spacing distance EP12 between the image side surface of the first spacing element and the object side surface of the second spacing element in the optical axis direction satisfy the following: 4.06≤d1m / EP12≤7.0.

[0006] According to another aspect of the present invention, an optical lens is provided, comprising a lens barrel, a lens group and a spacer element group assembled in the lens barrel, wherein the lens group is composed of eight lenses, and the lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence from the object side to the image side along the optical axis direction, wherein the second lens has a negative optical power; the spacer element group includes at least a first spacer element and a second spacer element, wherein the first spacer element is located between the first lens and the second lens and contacts the image side portion of the first lens, and the second spacer element is located between the second lens and the third lens and contacts the image side portion of the first lens. It is in contact with the image side portion of the second lens; the maximum height L of the lens barrel and the sum of the air intervals ∑AT between any two adjacent lenses in the lens group on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air interval T12 between the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02; the inner diameter d1s of the object side surface of the first spacing element, the outer diameter D0s of the object side end surface of the lens barrel, and the inner diameter d0s of the object side end surface of the lens barrel satisfy: 1.43≤d1s / (D0s-d0s)≤3.68.

[0007] According to another aspect of the present invention, an optical lens is provided, comprising a lens barrel, a lens group and a spacer element group assembled in the lens barrel, wherein the lens group is composed of eight lenses, and the lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence from the object side to the image side along the optical axis direction, wherein the first lens has a positive optical power, and the second lens has a negative optical power; and the spacer element group includes at least a first spacer element and a second spacer element, wherein the first spacer element is located between the first lens and the second lens and contacts the image side surface portion of the first lens, and the second spacer element is located between the first lens and the second lens and contacts the image side surface portion of the first lens, and the second spacer element is located between the second lens and ... The lens is in contact with the third lens and partially in contact with the image side surface of the second lens; the maximum height L of the lens barrel and the sum of the air intervals ∑AT between any two adjacent lenses in the lens group on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air interval T12 between the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02; the effective focal length f1 of the first lens, the refractive index N1 of the first lens, and the inner diameter d1s of the object side surface of the first spacing element satisfy: 6.59≤f1*N1 / d1s≤9.01.

[0008] Furthermore, the inner diameter d1s of the object side surface of the first spacer element, the outer diameter D1m of the image side surface of the first spacer element, the inner diameter d2s of the object side surface of the second spacer element, and the outer diameter D2m of the image side surface of the second spacer element satisfy: 0.87≤(D2m-d2s) / (D1m-d1s)≤2.31.

[0009] Furthermore, the inner diameter d0m of the image side end surface of the lens barrel and the effective focal length f8 of the eighth lens satisfy: -1.40≤d0m / f8≤0.07.

[0010] Furthermore, the inner diameter d1s of the object side surface of the first spacing element, the outer diameter D0s of the object side end surface of the lens barrel, and the inner diameter d0s of the object side end surface of the lens barrel satisfy the following relationship: 1.43≤d1s / (D0s-d0s)≤3.68.

[0011] Furthermore, the image side surface of the fifth lens is a convex surface, the spacer element group also includes a fifth spacer element, the fifth spacer element is located between the fifth lens and the sixth lens and partially contacts the image side surface of the fifth lens, and an outer diameter D5s of the object side surface of the fifth spacer element and a curvature radius R10 of the image side surface of the fifth lens satisfy: -2.97≤D5s / R10≤-1.21.

[0012] Furthermore, the third lens has positive optical power, and the spacer element group also includes a second spacer element and a third spacer element. The second spacer element is located between the second lens and the third lens and contacts with the image side portion of the second lens. The third spacer element is located between the third lens and the fourth lens and contacts with the image side portion of the third lens. The spacing distance EP23 between the image side portion of the second spacer element and the object side portion of the third spacer element in the optical axis direction, the effective focal length f3 of the third lens, and the center thickness CT3 of the third lens on the optical axis satisfy: 1.97≤f3 / (EP23+CT3)≤2.99.

[0013] Furthermore, the spacer element group also includes a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and contacts with the image side portion of the second lens, the third spacer element is located between the third lens and the fourth lens and contacts with the image side portion of the third lens, and the spacing distance EP23 between the image side portion of the second spacer element and the object side portion of the third spacer element in the optical axis direction, the outer diameter D3s of the object side portion of the third spacer element, and the inner diameter d3s of the object side portion of the third spacer element satisfy: 1.62≤(D3s-d3s) / EP23≤4.92.

[0014] Furthermore, the fourth lens has negative optical power, and the spacer element group also includes a third spacer element and a fourth spacer element. The third spacer element is located between the third lens and the fourth lens and contacts with the image side portion of the third lens. The fourth spacer element is located between the fourth lens and the fifth lens and contacts with the image side portion of the fourth lens. The spacing distance EP34 between the image side portion of the third spacer element and the object side portion of the fourth spacer element in the optical axis direction and the effective focal length f4 of the fourth lens satisfy: -7.68≤f4 / EP34≤-4.90.

[0015] Furthermore, the spacer element group also includes a third spacer element and a fourth spacer element, the third spacer element is located between the third lens and the fourth lens and contacts the image side portion of the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and contacts the image side portion of the fourth lens, and the spacing distance EP34 between the image side portion of the third spacer element and the object side portion of the fourth spacer element in the optical axis direction and the sum ∑EP of the spacing distances between the object side end face of the lens barrel and any two adjacent optical elements in the spacer element group on the optical axis satisfy: 4.86≤∑EP / EP34≤5.66.

[0016] Furthermore, the spacer element group also includes a fourth spacer element and a fifth spacer element. The fourth spacer element is located between the fourth lens and the fifth lens and contacts the image side portion of the fourth lens. The fifth spacer element is located between the fifth lens and the sixth lens and contacts the image side portion of the fifth lens. The spacing distance EP45 between the image side portion of the fourth spacer element and the object side portion of the fifth spacer element in the optical axis direction, the center thickness CT5 of the fifth lens on the optical axis, and the thickness CP5 of the fifth spacer element in the optical axis direction satisfy: 1.10≤CT5 / (EP45+CP5)≤3.37.

[0017] Further, the fifth lens has positive optical power, and the spacer element group also includes a fourth spacer element and a fifth spacer element. The fourth spacer element is located between the fourth lens and the fifth lens and contacts with the image side portion of the fourth lens. The fifth spacer element is located between the fifth lens and the sixth lens and contacts with the image side portion of the fifth lens. The inner diameter d4m of the image side portion of the fourth spacer element, the inner diameter d5s of the object side portion of the fifth spacer element, and the effective focal length f5 of the fifth lens satisfy: 1.78≤(d4m+d5s) / f5≤3.09.

[0018] Furthermore, the image side surface of the sixth lens is a convex surface, the spacer element group also includes a sixth spacer element, the sixth spacer element is located between the sixth lens and the seventh lens and partially contacts the image side surface of the sixth lens, and the inner diameter d6s of the object side surface of the sixth spacer element, the curvature radius R12 of the image side surface of the sixth lens, and the refractive index N6 of the sixth lens satisfy: -2.86≤d6s / R12≤-0.94.

[0019] Furthermore, the image side surface of the seventh lens is a concave surface, the spacer element group also includes a seventh spacer element, the seventh spacer element is located between the seventh lens and the eighth lens and partially contacts with the image side surface of the seventh lens, and an inner diameter d7s of the object side surface of the seventh spacer element, a curvature radius R13 of the object side surface of the seventh lens, and a curvature radius R14 of the image side surface of the seventh lens satisfy: -2.70≤d7s / (R13+R14)≤0.61.

[0020] Further, the seventh lens has negative optical power, the spacer element group also includes a seventh spacer element, the seventh spacer element is located between the seventh lens and the eighth lens and contacts with the image side portion of the seventh lens, and the combined focal length f78 of the seventh lens and the eighth lens, the outer diameter D7s of the object side surface of the seventh spacer element, and the inner diameter d7s of the object side surface of the seventh spacer element satisfy: -4.45≤f78 / (D7s-d7s)≤-1.55.

[0021] Furthermore, the spacer element group also includes a seventh spacer element and an eighth spacer element. The seventh spacer element is located between the seventh lens and the eighth lens and is in contact with the image side portion of the seventh lens. The eighth spacer element is located on the image side of the eighth lens and is in contact with the image side portion of the eighth lens. The spacing distance EP78 between the image side portion of the seventh spacer element and the object side portion of the eighth spacer element in the optical axis direction, the outer diameter D8s of the object side portion of the eighth spacer element, and the inner diameter d8s of the object side portion of the eighth spacer element satisfy the following: 1.91≤EP78 / (D8s-d8s)≤2.53.

[0022] Furthermore, the optical lens satisfies at least one of the following:

[0023] The first lens has positive power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave;

[0024] The object side surface of the second lens is concave, and the image side surface of the second lens is convex;

[0025] The object side surface of the third lens is convex;

[0026] The object side surface of the fourth lens is concave;

[0027] The object side surface of the fifth lens is convex;

[0028] The object side surface of the sixth lens is concave;

[0029] The object-side surface of the eighth lens is concave.

[0030] The technical solution of the present invention is applied, and the optical lens comprises a lens barrel, and a lens group and a spacer element group assembled in the lens barrel, wherein the lens group consists of eight lenses, and the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence from the object side to the image side along the optical axis direction; the spacer element group comprises at least a first spacer element and a second spacer element, the first spacer element is located between the first lens and the second lens and contacts with the image side surface portion of the first lens, the second lens has a negative optical power, the second spacer element is located between the second lens and the third lens and contacts with the second lens The image side surface of the first spacing element is partially in contact with the image side surface; the maximum height L of the lens barrel and the sum of the air spacings ∑AT between any two adjacent lenses in the lens group on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air spacing T12 between the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02; the inner diameter d1m of the image side surface of the first spacing element and the spacing distance EP12 between the image side surface of the first spacing element and the object side surface of the second spacing element in the optical axis direction satisfy: 4.06≤d1m / EP12≤7.0.

[0031] The optical lens of the present application is composed of a lens barrel, eight lenses and at least two spacer elements. By reasonably arranging the optical lens, the maximum height L of the lens barrel and the sum of the air intervals ∑AT between any two adjacent lenses in the lens group on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air interval T12 between the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02. The overall size and air gap of the optical lens are constrained to ensure the miniaturization of the optical lens. In the design of a miniaturized optical lens, the size control of the optical lens is closely related to the discrete degree of the defocus curve. Due to the limitations of the lens size and gap, the overall size and air gap of the optical lens are constrained to ensure the miniaturization of the optical lens. , resulting in an increase in the edge light deflection angle of the second lens during assembly adjustment, which ultimately affects the smoothness of the defocus curve. The defocus curve may show a large discreteness, which will cause unstable system imaging performance. At the same time, the second lens will have a greater impact on the optical path difference in different fields of view, resulting in edge discreteness. In order to solve this problem, the present application constrains d1m / EP12 within a reasonable range, which can ensure that the light beam has an appropriate beam width when passing through the first spacing element, avoid the edge light refraction angle is too large, and scattering or defocusing occurs, and at the same time avoid the gap between the first spacing element and the second spacing element is too large, effectively reducing the influence of mechanical tolerance on the defocus curve, and ensuring the stability of the imaging performance of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0033] Figure 1 A dimensioning diagram of an optical lens of an optional embodiment of the present invention is shown;

[0034] Figure 2 A schematic structural diagram of an optical lens according to Embodiment 1-1 of the present invention is shown;

[0035] Figure 3 A schematic structural diagram of an optical lens according to Embodiment 1-2 of the present invention is shown;

[0036] Figure 4 A schematic diagram showing the structure of an optical lens according to embodiments 1 to 3 of the present invention is shown;

[0037] Figures 5 to 8 The magnification chromatic aberration curve, axial chromatic aberration, astigmatism curve and distortion curve of the optical lens of the first embodiment of the present invention are respectively shown;

[0038] Fig. 9 A schematic structural diagram of an optical lens according to Embodiment 2-1 of the present invention is shown;

[0039] Fig.10 A schematic structural diagram of an optical lens according to Embodiment 2-2 of the present invention is shown;

[0040] Fig.11 A schematic structural diagram of an optical lens according to Embodiment 2-3 of the present invention is shown;

[0041] Figures 12 to 15 The magnification chromatic aberration curve, axial chromatic aberration, astigmatism curve and distortion curve of the optical lens of the second embodiment of the present invention are respectively shown;

[0042] Fig.16 A schematic structural diagram of an optical lens according to Embodiment 3-1 of the present invention is shown;

[0043] Fig.17 A schematic structural diagram of an optical lens according to Embodiment 3-2 of the present invention is shown;

[0044] Fig.18 A schematic structural diagram of an optical lens according to Embodiment 3-3 of the present invention is shown;

[0045] Figures 19 to 22 The magnification chromatic aberration curve, axial chromatic aberration, astigmatism curve and distortion curve of the optical lens of the third embodiment of the present invention are respectively shown;

[0046] Fig.23A diffraction limit modulation curve diagram of an optical lens according to an optional embodiment of the present invention is shown;

[0047] Fig.24 A diffraction limit modulation curve diagram of an optical lens according to another optional embodiment of the present invention is shown;

[0048] Fig.25 A diffraction-limited modulation curve diagram of an optical lens in an example is shown;

[0049] Fig.26 A diffraction-limited modulation curve diagram of an optical lens in another example is shown.

[0050] The above drawings include the following reference numerals:

[0051] E1, first lens; P1, first spacing element; E2, second lens; P2, second spacing element; E3, third lens; P3, third spacing element; E4, fourth lens; P4, fourth spacing element; E5, fifth lens; P5, fifth spacing element; E6, sixth lens; P6, sixth spacing element; E7, seventh lens; P7, seventh spacing element; E8, eighth lens; P8, eighth spacing element; S1, object side surface of the first lens; S2, image side surface of the first lens; S3, The object side surface of the second lens; S4, the image side surface of the second lens; S5, the object side surface of the third lens; S6, the image side surface of the third lens; S7, the object side surface of the fourth lens; S8, the image side surface of the fourth lens; S9, the object side surface of the fifth lens; S10, the image side surface of the fifth lens; S11, the object side surface of the sixth lens; S12, the image side surface of the sixth lens; S13, the object side surface of the seventh lens; S14, the image side surface of the seventh lens; S15, the object side surface of the eighth lens; S16, the image side surface of the eighth lens. DETAILED DESCRIPTION

[0052] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0054] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0055] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the technical solution of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0056] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0057] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of the general knowledge in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. In the present application, the left side is the object side and the right side is the image side. The object side surface of the spacer element refers to the surface of the spacer element that is located most on the object side and perpendicular to the optical axis, the image side surface of the spacer element refers to the surface of the spacer element that is located most on the image side and perpendicular to the optical axis, the object side end surface of the lens barrel refers to the surface of the lens barrel that is located most on the object side and perpendicular to the optical axis, and the image side end surface of the lens barrel refers to the surface of the lens barrel that is located most on the image side and perpendicular to the optical axis.

[0058] In order to solve the problem in the prior art that the edge field of view of an optical lens is increasingly discrete due to the need for miniaturization, the present invention provides an optical lens.

[0059] like Figures 1 to 22As shown, the optical lens comprises a lens barrel, a lens group and a spacer element group assembled in the lens barrel, the lens group consists of eight lenses, and the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence from the object side to the image side along the optical axis direction, and the second lens has a negative optical power; the spacer element group comprises at least a first spacer element and a second spacer element, the first spacer element is located between the first lens and the second lens and partially contacts with the image side surface of the first lens, and the second spacer element is located between the second lens and the third lens and contacts with the image side surface of the second lens Partial contact; the maximum height L of the lens barrel and the sum of the air spacing ∑AT between any two adjacent lenses in the lens group on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air spacing T12 between the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02; the inner diameter d1m of the image side surface of the first spacing element and the spacing distance EP12 between the image side surface of the first spacing element and the object side surface of the second spacing element in the optical axis direction satisfy: 4.06≤d1m / EP12≤7.0.

[0060] The optical lens of the present application is composed of a lens barrel, eight lenses and at least two spacer elements. By reasonably arranging the optical lens, the maximum height L of the lens barrel and the sum of the air intervals ∑AT between any two adjacent lenses in the lens group on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air interval T12 between the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02. The overall size and air gap of the optical lens are constrained to ensure the miniaturization of the optical lens. In the design of a miniaturized optical lens, the size control of the optical lens is closely related to the discrete degree of the defocus curve. Due to the limitations of the lens size and gap, the overall size and air gap of the optical lens are constrained to ensure the miniaturization of the optical lens. , resulting in an increase in the edge light deflection angle of the second lens during assembly adjustment, which ultimately affects the smoothness of the defocus curve. The defocus curve may show a large discreteness, which will cause unstable system imaging performance. At the same time, the second lens will have a greater impact on the optical path difference in different fields of view, resulting in edge discreteness. In order to solve this problem, the present application constrains d1m / EP12 within a reasonable range, which can ensure that the light beam has an appropriate beam width when passing through the first spacing element, avoid the edge light refraction angle is too large, and scattering or defocusing occurs, and at the same time avoid the gap between the first spacing element and the second spacing element is too large, effectively reducing the influence of mechanical tolerance on the defocus curve, and ensuring the stability of the imaging performance of the optical lens.

[0061] In addition, refer to Table 1 and Figure 23 to Figure 26 As shown, Fig.23A diffraction-limited modulation curve diagram is shown when L / ∑AT=2.8, f2 / T12=-17.2, and d1m / EP12=4.55, wherein the abscissa is the defocus position in mm, and the ordinate is the modulation value, which is dimensionless. Fig.24 The diffraction-limited modulation curve is shown when L / ∑AT=2.8, f2 / T12=-17.2, and d1m / EP12=5.78. Fig.23 and Fig.24 It can be seen that when the optical lens satisfies 4.06≤d1m / EP12≤7.0, the size of the first spacing element and the sizes of the first spacing element and the second spacing element are reasonably designed, and the defocus curve is normal. Fig.25 The diffraction-limited modulation curve is shown when L / ∑AT=2.8, f2 / T12=-17.2, d1m / EP12=1.35. Fig.25 It can be seen that when d1m / EP12 is less than 4.06, the spacing distance between the first spacing element and the second spacing element in the optical axis direction is too large, and the sensitivity of the optical lens is high, resulting in a sharp change in the edge light angle, causing the edge field of view to become discrete. Fig.26 The diffraction-limited modulation curve is shown when L / ∑AT=2.8, f2 / T12=-17.2, and d1m / EP12=8.58. Fig.26 It can be seen that when d1m / EP12 is greater than 7.0, the distance between the first spacing element and the second spacing element in the optical axis direction is too small, the refraction angle of the edge light is too large, and the light refraction is steep, resulting in increased discreteness of the edge field of view. Figure 23 to Figure 26 It can be seen that when the optical lens meets 4.06≤d1m / EP12≤7.0, the defocus curve is normal and the imaging performance is stable. Figure 23 to Figure 26 In the figure, the theoretical limit is the curve of the diffraction limit under the theoretical state, and the field of view 4 is the curve under the 1F field of view, that is, the modulation curve formed by the light of the full field of view, where F can be understood as the maximum field of view or the full field of view. The field of view 3 is the curve under the 0.55F field of view, that is, the modulation curve formed by the light of 0.55 times the full field of view. The field of view 2 is the curve under the 0.33F field of view, that is, the modulation curve formed by the light of 0.33 times the full field of view. The field of view 1 is the curve under the 0F field of view, that is, the modulation curve formed by the light of the central field of view.

[0062]

[0063]

[0064] Table 1

[0065] It should be noted that the present application limits d1m / EP126 within a reasonable range, constrains the size of the first spacing element and the spacing distance between the first spacing element and the second spacing element to ensure the deflection angle of the edge light, reduce scattering or defocusing, ensure the stability of the imaging performance of the optical lens, and solve the problem of increased edge field of view discreteness when L / ∑AT is in the range of 2.53 to 3.12 and f2 / T12 is in the range of -19.89 to -16.02. When d1m / EP12 meets the above range, the increased edge field of view discreteness of the optical lens can be improved, and it does not depend on the optical focal length and surface shape of other lenses. The optical focal length and surface shape of other lenses are further optimization of the optical lens on this basis. The other lenses can be positive or negative according to the actual design requirements of the optical system, and the surface shapes of the other lenses can also be convex or concave according to the design requirements of the optical system. The optical system can have good relative illumination performance when it meets: 2.53≤L / ∑AT≤3.12; -19.89≤f2 / T12≤-16.02; 4.06≤d1m / EP12≤7.0.

[0066] For example, in some optional embodiments, the first lens has a positive focal length, which can converge the light so that the large-angle light is deflected toward the optical axis to further increase the light intensity of the edge light. For another example, in some optional embodiments, the second lens has a negative focal length, which can balance the aberration caused by the first lens, which is conducive to further improving the imaging quality. For another example, in some optional embodiments, the third lens has a positive focal length, which properly converges the light so that the light smoothly transitions to the rear. For another example, in some optional embodiments, the fourth lens has a negative focal length, which balances the aberration caused by the front lens, improves the imaging quality, and properly diverges the light, which is conducive to the smooth transition of the light to the rear optical system. For another example, in some optional embodiments, the fifth lens has a positive focal length, which can properly converge the light to avoid serious light diffusion and mismatch with the chip. For another example, in some optional embodiments, the seventh lens has a negative focal length, which can balance the aberration caused by the front positive lens, improve the imaging quality, and properly diverge the light, which is conducive to the smooth transition of the light to the imaging surface. For another example, in some optional embodiments, the object side of the first lens is convex, the image side of the first lens is concave, the object side of the second lens is concave, the image side of the second lens is convex, the object side of the third lens is convex, the object side of the fourth lens is concave, the object side of the fifth lens is convex, the image side of the fifth lens is convex, the object side of the sixth lens is concave, the image side of the sixth lens is convex, the image side of the seventh lens is concave, and the object side of the eighth lens is concave. By reasonably constraining the surface shape of each lens, it is beneficial to reasonably constrain the light trend, ensure the smooth transition of light, and help correct aberration. The optical lens can be simulated by software and / or tools such as ZEMAX, CODEV, etc. Preferably, the optical lens can be simulated by CODEV. In the process of using such as the above-mentioned software and / or tools for simulation, the surface shape of each lens can be simulated and appropriately adjusted according to the self-contained surface shape of the software and / or tools used.

[0067] Wherein, ∑AT=T12+T23+T34+T45+T56+T67+T78, wherein T12 is the center thickness of the first lens and the second lens on the optical axis, T23 is the center thickness of the second lens and the third lens on the optical axis, T34 is the center thickness of the third lens and the fourth lens on the optical axis, T45 is the center thickness of the fourth lens and the fifth lens on the optical axis, T56 is the center thickness of the fifth lens and the sixth lens on the optical axis, T67 is the center thickness of the sixth lens and the seventh lens on the optical axis, and T78 is the center thickness of the seventh lens and the eighth lens on the optical axis.

[0068] In some optional embodiments, the inner diameter d1s of the object side surface of the first spacing element, the outer diameter D1m of the image side surface of the first spacing element, the inner diameter d2s of the object side surface of the second spacing element, and the outer diameter D2m of the image side surface of the second spacing element satisfy: 0.87≤(D2m-d2s) / (D1m-d1s)≤2.31. By constraining (D2m-d2s) / (D1m-d1s) within a reasonable range, the luminous flux of the imaging system can be effectively balanced, excess stray light can be intercepted, and the inner and outer diameters of the first spacing element and the second spacing element can be reasonably designed to block stray light while maintaining effective transmission of imaging light, ensuring that the imaging system can obtain stable imaging quality under various lighting conditions.

[0069] In some optional embodiments, the inner diameter d0m of the image side end surface of the lens barrel and the effective focal length f8 of the eighth lens satisfy: -1.40≤d0m / f8≤0.07. By controlling the ratio between the inner diameter of the image side end surface of the lens barrel and the effective focal length of the eighth lens within a reasonable range, it is possible to ensure that the effective focal length of the eighth lens matches the inner diameter of the image side end surface of the lens barrel, so that the light can be accurately focused, and the imaging effect of the imaging system can be optimized while maintaining the focal length accuracy.

[0070] In some optional embodiments, the inner diameter d1s of the object side surface of the first spacing element, the outer diameter D0s of the object side end surface of the lens barrel, and the inner diameter d0s of the object side end surface of the lens barrel satisfy the following relationship: 1.43≤d1s / (D0s-d0s)≤3.68. By constraining d1s / (D0s-d0s) within a reasonable range, it is beneficial for the light to enter the lens group smoothly, and the range of the light entering the lens group is controlled, so as to optimize the collimation of the light beam, ensure that the light beam is transmitted in the imaging system without excessive deflection or scattering, and at the same time ensure the precise positioning of the optical element during the assembly process, reduce the error in the imaging system, and improve the overall mechanical stability of the optical lens.

[0071] In some optional embodiments, the spacer element group further includes a fifth spacer element, which is located between the fifth lens and the sixth lens and partially contacts the image side surface of the fifth lens, and the outer diameter D5s of the object side surface of the fifth spacer element and the curvature radius R10 of the image side surface of the fifth lens satisfy: -2.97≤D5s / R10≤-1.21. By constraining D5s / R10 within a reasonable range, the deflection angle of the light on the image side surface of the fifth lens can be controlled, avoiding large-angle deflection of the light on the image side surface of the fifth lens, reducing unnecessary astigmatism caused by excessively large deflection angles, and helping to improve imaging quality.

[0072] In some optional embodiments, the spacer element group further includes a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and partially contacts the image side surface of the second lens, the third spacer element is located between the third lens and the fourth lens and partially contacts the image side surface of the third lens, and the spacing distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element in the optical axis direction, the effective focal length f3 of the third lens, and the center thickness CT3 of the third lens on the optical axis satisfy: 1.97≤f3 / (EP23+CT3)≤2.99. By constraining f3 / (EP23+CT3) within a reasonable range, the propagation path of the edge field light can be effectively adjusted, thereby reducing the deviation of the focus position, thereby making the defocus curve smoother, and at the same time, the refined design of EP23 can reduce the light scattering caused by the edge effect, thereby reasonably allocating the sensitivity of the entire imaging system. By reducing the situation where the propagation path is unstable due to the change in edge thickness, it is beneficial to improve the stability of the propagation path of the edge light, thereby improving the overall optical performance of the imaging system and reducing the discreteness of the defocus curve.

[0073] In some optional embodiments, the spacer element group further includes a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and is in contact with the image side portion of the second lens, the third spacer element is located between the third lens and the fourth lens and is in contact with the image side portion of the third lens, and the spacing distance EP23 between the image side portion of the second spacer element and the object side portion of the third spacer element in the optical axis direction, the outer diameter D3s of the object side portion of the third spacer element, and the inner diameter d3s of the object side portion of the third spacer element satisfy: 1.62≤(D3s-d3s) / EP23≤4.92. By constraining (D3s-d3s) / EP23 within a reasonable range, it is possible to effectively intercept excess light, prevent excessive diffusion of light during transmission, and cause an increase in astigmatism, while maintaining uniform propagation of light and avoiding imaging errors caused by excessively wide or narrow propagation channels.

[0074] In some optional embodiments, the spacer element group further includes a third spacer element and a fourth spacer element, the third spacer element is located between the third lens and the fourth lens and partially contacts the image side surface of the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and partially contacts the image side surface of the fourth lens, and the spacing distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element in the optical axis direction and the effective focal length f4 of the fourth lens satisfy: -7.68≤f4 / EP34≤-4.90. By constraining f4 / EP34 within a reasonable range, the relative relationship between the focusing ability of the fourth lens and the spacing distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element in the optical axis direction is controlled, so that the light can be effectively focused when passing through the fourth lens, reducing the imaging problems such as spherical aberration and astigmatism caused by uneven refraction during the propagation of light, while maintaining the compactness of the imaging system, optimizing the focusing effect of the light beam, improving the optical imaging quality, and reducing the discreteness of the defocus curve.

[0075] In some optional embodiments, the spacer element group further includes a third spacer element and a fourth spacer element, the third spacer element is located between the third lens and the fourth lens and partially contacts the image side surface of the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and partially contacts the image side surface of the fourth lens, and the spacing distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element in the optical axis direction and the sum of the spacing distances ∑EP between the object side end surface of the lens barrel and any two adjacent optical elements in the spacer element group on the optical axis satisfy: 4.86≤∑EP / EP34≤5.66. By constraining ∑EP / EP34 within a reasonable range, it is helpful to control the distribution of the spacing distances between the spacer elements, reduce the relative position errors between the spacer elements, ensure the stability of the optical path, reduce the fluctuation of the optical performance caused by tolerance, and ensure the stability of the optical imaging quality.

[0076] Among them, ∑EP=EP01+EP12+EP23+EP34+EP45+EP56+EP67+EP78, wherein EP01 is the spacing distance between the object side end face of the lens barrel and the object side face of the first spacing element in the direction of the optical axis, EP12 is the spacing distance between the image side face of the first spacing element and the object side face of the second spacing element in the direction of the optical axis, EP23 is the spacing distance between the image side face of the second spacing element and the object side face of the third spacing element in the direction of the optical axis, EP34 is the spacing distance between the image side face of the third spacing element and the object side face of the fourth spacing element in the direction of the optical axis, EP45 is the spacing distance between the image side face of the fourth spacing element and the object side face of the fifth spacing element in the direction of the optical axis, EP56 is the spacing distance between the image side face of the fifth spacing element and the object side face of the sixth spacing element in the direction of the optical axis, EP67 is the spacing distance between the image side face of the sixth spacing element and the object side face of the seventh spacing element in the direction of the optical axis, and EP78 is the spacing distance between the image side face of the seventh spacing element and the object side face of the eighth spacing element in the direction of the optical axis.

[0077] In some optional embodiments, the spacer element group further includes a fourth spacer element and a fifth spacer element, the fourth spacer element is located between the fourth lens and the fifth lens and partially contacts the image side surface of the fourth lens, the fifth spacer element is located between the fifth lens and the sixth lens and partially contacts the image side surface of the fifth lens, and the spacing distance EP45 between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element in the optical axis direction, the center thickness CT5 of the fifth lens on the optical axis, and the thickness CP5 of the fifth spacer element in the optical axis direction satisfy: 1.10≤CT5 / (EP45+CP5)≤3.37. By constraining CT5 / (EP45+CP5) within a reasonable range to ensure that the position and thickness of the fifth lens in the imaging system are more adapted, so as to control spherical aberration and astigmatism, and at the same time make the light transition smoothly in the fifth lens, the deviation of the focusing position of different light rays can be reduced, ensuring better imaging quality.

[0078] In some optional embodiments, the spacer element group further includes a fourth spacer element and a fifth spacer element, the fourth spacer element is located between the fourth lens and the fifth lens and contacts the image side portion of the fourth lens, the fifth spacer element is located between the fifth lens and the sixth lens and contacts the image side portion of the fifth lens, and the inner diameter d4m of the image side portion of the fourth spacer element, the inner diameter d5s of the object side portion of the fifth spacer element, and the effective focal length f5 of the fifth lens satisfy: 1.78≤(d4m+d5s) / f5≤3.09. By constraining (d4m+d5s) / f5 within a reasonable range, the propagation path and light range of the light in the fifth lens can be controlled to ensure that the light can be effectively focused when passing through the fifth lens, avoiding the problem of out-of-focus caused by excessive divergence or over-focusing of the light beam, and avoiding the situation of insufficient light transmission caused by the fourth spacer element and the fifth spacer element blocking the light, and effectively blocking stray light to ensure imaging quality.

[0079] In some optional embodiments, the spacer element group further includes a sixth spacer element, which is located between the sixth lens and the seventh lens and partially contacts the image side surface of the sixth lens, and the inner diameter d6s of the object side surface of the sixth spacer element, the radius of curvature R12 of the image side surface of the sixth lens, and the refractive index N6 of the sixth lens satisfy: -2.86≤d6s / R12≤-0.94. By constraining d6s / R12 within a reasonable range, the refraction angle of the light on the image side surface of the sixth lens is effectively controlled, so that the light is evenly distributed on the imaging surface after passing through the sixth lens, ensuring the reasonable distribution of the light on the imaging surface, reducing the sensitivity of the sixth lens, and at the same time constraining the light range to ensure the luminous flux emitted to the rear system through the sixth lens.

[0080] In some optional embodiments, the spacer element group further includes a seventh spacer element, which is located between the seventh lens and the eighth lens and partially contacts the image side surface of the seventh lens, and the inner diameter d7s of the object side surface of the seventh spacer element, the radius of curvature R13 of the object side surface of the seventh lens, and the radius of curvature R14 of the image side surface of the seventh lens satisfy: -2.70≤d7s / (R13+R14)≤0.61. By constraining d7s / (R13+R14) within a reasonable range, the degree of deflection of light when passing through the seventh lens and the range of light passing through the seventh spacer element are controlled, which is conducive to reducing the light deflected at a large angle from entering the rear imaging system, and can reduce the focusing difference of the light after refraction, thereby reducing spherical aberration, helping to control the refraction and focusing of light in different directions, and can ensure that the light can be focused on the same plane in both the vertical and horizontal directions, effectively reducing light dispersion, and improving imaging quality.

[0081] In some optional embodiments, the spacer element group further includes a seventh spacer element, which is located between the seventh lens and the eighth lens and partially contacts the image side surface of the seventh lens, and the combined focal length f78 of the seventh lens and the eighth lens, the outer diameter D7s of the object side surface of the seventh spacer element, and the inner diameter d7s of the object side surface of the seventh spacer element satisfy: -4.45≤f78 / (D7s-d7s)≤-1.55. By constraining f78 / (D7s-d7s) within a reasonable range, it is possible to ensure that the light propagation path is more stable and collimated, prevent the light from having a smaller refraction angle and thus generating a larger beam diffusion, and generate spherical aberration, thereby improving the light flux and response speed of the imaging system.

[0082] In some optional embodiments, the spacer element group further includes a seventh spacer element and an eighth spacer element, the seventh spacer element is located between the seventh lens and the eighth lens and partially contacts the image side surface of the seventh lens, the eighth spacer element is located on the image side of the eighth lens and partially contacts the image side surface of the eighth lens, and the spacing distance EP78 between the image side surface of the seventh spacer element and the object side surface of the eighth spacer element in the optical axis direction, the outer diameter D8s of the object side surface of the eighth spacer element, and the inner diameter d8s of the object side surface of the eighth spacer element satisfy: 1.91≤EP78 / (D8s-d8s)≤2.53. By constraining EP78 / (D8s-d8s) within a reasonable range, the path of the light beam passing through the area can be accurately adjusted to prevent the light beam channel from becoming narrow, affecting the collimation of the light beam, causing the light to scatter when passing through the eighth spacer element, causing astigmatism; at the same time, it can also ensure that the refraction angle of the light beam remains consistent when passing through the eighth spacer element, avoiding uneven focus due to excessive bending or diffusion of the light beam, thereby effectively reducing aberrations and maintaining image clarity.

[0083] In another embodiment of the present invention, the optical lens comprises a lens barrel, and a lens group and a spacer element group assembled in the lens barrel, the lens group consists of eight lenses, and the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence from the object side to the image side along the optical axis direction, and the second lens has a negative optical power; the spacer element group comprises at least a first spacer element and a second spacer element, the first spacer element is located between the first lens and the second lens and contacts the image side portion of the first lens, the second spacer element is located between the second lens and the third lens and contacts the image side portion of the first lens, The image side surfaces of the two lenses are partially in contact; the maximum height L of the lens barrel and the sum of the air spacings ∑AT between any two adjacent lenses in the lens group on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air spacing T12 between the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02; the inner diameter d1s of the object side surface of the first spacing element, the outer diameter D0s of the object side end surface of the lens barrel, and the inner diameter d0s of the object side end surface of the lens barrel satisfy: 1.43≤d1s / (D0s-d0s)≤3.68.

[0084] The optical lens of the present application is composed of a lens barrel, eight lenses and at least two spacing elements. By reasonably arranging the optical lens, the maximum height L of the lens barrel and the sum of the air spacing ∑AT between any two adjacent lenses in the lens group on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air spacing T12 between the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02. The overall size and air gap of the optical lens are constrained to ensure the miniaturization of the optical lens. In the design of a miniaturized optical lens, the size control of the optical lens is closely related to the discrete degree of the defocus curve. Due to the limitation of the lens size and the gap, the assembly adjustment When the light is not reflected, the deflection angle of the edge light of the second lens increases, which eventually affects the smoothness of the defocus curve. The defocus curve may show a large discreteness, which will cause unstable imaging performance of the system. At the same time, the second lens will have a great impact on the optical path difference of different fields of view, resulting in edge discreteness. In order to solve this problem, the present application constrains d1s / (D0s-d0s) within a reasonable range, which is conducive to the smooth entry of light into the lens group and controls the range of light entering the lens group, so as to optimize the collimation of the light beam and ensure that the light beam is not excessively deflected or scattered during transmission in the imaging system. It can ensure that the light beam has an appropriate beam width when passing through the first spacing element to avoid excessive refraction angle of the edge light, resulting in scattering or defocusing.

[0085] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0086] In another embodiment of the present invention, the optical lens comprises a lens barrel, a lens group and a spacer element group assembled in the lens barrel, the lens group consists of eight lenses, the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence from the object side to the image side along the optical axis direction, the first lens has a positive focal length, and the second lens has a negative focal length; the spacer element group comprises at least a first spacer element and a second spacer element, the first spacer element is located between the first lens and the second lens and is in contact with the image side portion of the first lens, and the second spacer element is located at the second lens The lens barrel has a maximum height L and a total air spacing ∑AT between any two adjacent lenses in the lens group on the optical axis satisfying: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air spacing T12 between the first lens and the second lens on the optical axis satisfying: -19.89≤f2 / T12≤-16.02; the effective focal length f1 of the first lens, the refractive index N1 of the first lens and the inner diameter d1s of the object side of the first spacing element satisfying: 6.59≤f1*N1 / d1s≤9.01.

[0087] The optical lens of the present application is composed of a lens barrel, eight lenses and at least two spacer elements. By reasonably arranging the optical lens, the maximum height L of the lens barrel and the sum of the air intervals ∑AT between any two adjacent lenses in the lens group on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air interval T12 between the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02. The overall size and air gap of the optical lens are constrained to ensure the miniaturization of the optical lens. In the design of a miniaturized optical lens, the size control of the optical lens is closely related to the discrete degree of the defocus curve. Since the lens size The limitation of the gap leads to an increase in the deflection angle of the edge light of the second lens during assembly adjustment, which ultimately affects the smoothness of the defocus curve. The defocus curve may show a large discreteness, which will lead to unstable imaging performance of the system. At the same time, the second lens will have a great impact on the optical path difference of different fields of view, resulting in edge discreteness. In order to solve this problem, the present application constrains f1*N1 / d1s within a reasonable range, which can control the degree of deflection of the light at the first lens, which is beneficial to the convergence of the edge light, and can ensure that the light beam has an appropriate beam width when passing through the first spacing element, avoiding the situation where the refraction angle of the edge light is too large, and scattering or defocusing occurs, which is beneficial to improving the imaging performance of the optical lens.

[0088] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0089] Optionally, the optical lens may further include a filter located between the imaging surface and the lens group.

[0090] Optionally, the optical lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0091] It should be noted that each lens is composed of an optical effective diameter area located at the center and an optical structure area located at the edge. The central optical effective diameter area and the edge structure area are composed of the optical structure area located at the outer peripheral side of the optical effective diameter area and arranged around the circumference of the optical effective diameter area. The optical effective diameter area is used for the passage of imaging light, while the optical structure area is not used for the passage of imaging light and is used to abut against the lens barrel or adjacent lenses or adjacent spacing elements. The optical structure area is also called a non-effective diameter area.

[0092] The optical lens in the present application may use multiple lenses, such as the eight lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0093] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical lens can be changed to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiments, the optical lens is not limited to including eight lenses. If necessary, the optical lens may also include other numbers of lenses.

[0094] Figure 1 A schematic diagram of the dimension marking of an optical lens of the present application is shown. Figure 1 Parameters such as d1s, d1m, D1m, d2s, D2m, d3s, D3s, d4m, d5s, D5s, d6s, d7s, D7s, d8s, D8s, d0s, d0m, D0s, EP12, EP23, EP34, EP45, CP5, EP78, and L are indicated in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the description of the optical lens and the surface shape of the specific lens, these parameters will no longer be reflected in the drawings when the specific embodiments are described later.

[0095] The following further describes examples of specific surface shapes and parameters of the optical lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0096] It should be noted that in the following embodiment 1, there are three examples, namely, embodiment 1-1, embodiment 1-2, and embodiment 1-3; in embodiment 2, there are three examples, namely, embodiment 2-1, embodiment 2-2, and embodiment 2-3; and in embodiment 3, there are three examples, namely, embodiment 3-1, embodiment 3-2, and embodiment 3-3. In the three examples of the same embodiment, the parameters such as the radius of curvature, center thickness, and spacing distances between lenses of the optical lens from the first lens to the eighth lens, as well as the coefficients of higher-order terms are the same, but the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel, the first spacing element, the second spacing element, and the third spacing element, as well as the shapes of some lenses are different. In other words, the main structures for imaging are the same, but the auxiliary structures for imaging are different.

[0097] It should be noted that any of the following embodiments 1 to 3 are applicable to all implementation methods of the present application.

[0098] Embodiment 1

[0099] like Figures 2 to 8 As shown, the optical lens of embodiment 1 is described. Figure 2 The structure diagram of the optical lens of Example 1-1 is shown. Figure 3 The structure diagram of the optical lens of Example 1-2 is shown. Figure 4 The schematic diagrams of the structures of the optical lenses of Examples 1-3 are shown.

[0100] like Figures 2 to 4 As shown, the optical lens includes a lens barrel, eight lenses and a plurality of spacer elements. The lens barrel includes a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, an eighth lens E8 and an eighth spacer element P8, which are arranged in sequence from the object side to the image side.

[0101] like Figure 21-1, is the structural representation of the optical lens of embodiment 1-1. In this example, the object side surface S1 of the first lens contacts with the lens barrel portion. The object side surface and the image side surface of the first spacer element contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively. The object side surface and the image side surface of the second spacer element contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively. The object side surface and image side surface of the third spacer element are in partial contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, the object side surface and image side surface of the fourth spacer element are in partial contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, the object side surface and image side surface of the fifth spacer element are in partial contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, the object side surface and image side surface of the sixth spacer element are in partial contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens respectively, the object side surface and image side surface of the seventh spacer element are in partial contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens respectively, and the image side surface S16 of the eighth lens is in partial contact with the object side surface of the eighth spacer element.

[0102] like Figure 3 FIG. 1 is a schematic diagram of the structure of the optical lens of Example 1-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0103] like Figure 4 FIG. 1 is a schematic diagram of the structure of the optical lens of Example 1-3. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0104] In summary, the structural parameters of the optical lens of Example 1 in Example 1-1, Example 1-2, and Example 1-3 are shown in Table 9.

[0105] In Embodiment 1, the first lens has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens has negative focal power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The third lens has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens has negative focal power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is concave. The fifth lens has positive focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens has positive focal power, the object side surface S11 of the sixth lens is concave, and the image side surface S12 of the sixth lens is convex. The seventh lens has negative focal power, the object side surface S13 of the seventh lens is convex, and the image side surface S14 of the seventh lens is concave. The eighth lens has negative power, the object side surface S15 of the eighth lens is a concave surface, and the image side surface S16 of the eighth lens is a concave surface. Among them, S17 and S18 (not shown in the figure) in Table 2 can be the object side surface and image side surface of the filter or protective glass, S19 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture, and the aperture is located on the first lens.

[0106] Table 2 shows the basic structural parameters of the optical lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0107]

[0108] Table 2

[0109] In the first embodiment, the object-side surface and the image-side surface of the first lens E1 to the eighth lens E8 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0110]

[0111] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 3 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspheric mirror surface S1-S16 in Example 1.

[0112]

[0113]

[0114] Table 3

[0115] Figure 5 The magnification chromatic aberration curve of the optical lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 6 The axial chromatic aberration curve of the optical lens of the first embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the optical lens. Figure 7 The astigmatism curve of the optical lens of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 8 The distortion curve of the optical lens of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different image heights.

[0116] Embodiment 2

[0117] like Figures 9 to 15 As shown, the optical lens of the second embodiment is described. Fig. 9 The structure diagram of the optical lens of Example 2-1 is shown. Fig.10 FIG. 2 shows a schematic structural diagram of an optical lens of Example 2-2. Fig.11 A schematic structural diagram of the optical lens of Example 2-3 is shown.

[0118] like Figures 9 to 11 As shown, the optical lens includes a lens barrel, eight lenses and a plurality of spacer elements. The lens barrel includes a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, an eighth lens E8 and an eighth spacer element P8, which are arranged in sequence from the object side to the image side.

[0119] like Fig. 92-1. The structure diagram of the optical lens of embodiment 2-1 is shown in FIG. In this example, the object side surface S1 of the first lens contacts the lens barrel portion. The object side surface and the image side surface of the first spacer element contact the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively. The object side surface and the image side surface of the second spacer element contact the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively. The object side surface and image side surface of the third spacer element are in partial contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, the object side surface and image side surface of the fourth spacer element are in partial contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, the object side surface and image side surface of the fifth spacer element are in partial contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, the object side surface and image side surface of the sixth spacer element are in partial contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens respectively, the object side surface and image side surface of the seventh spacer element are in partial contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens respectively, and the image side surface S16 of the eighth lens is in partial contact with the object side surface of the eighth spacer element.

[0120] like Fig.10 FIG. 2 is a schematic diagram of the structure of the optical lens of Example 2-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0121] like Fig.11 FIG. 2 is a schematic diagram of the structure of the optical lens of Example 2-3. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0122] In summary, the structural parameters of the optical lens of Example 2 in Example 2-1, Example 2-2, and Example 2-3 are shown in Table 9.

[0123] In the second embodiment, the first lens has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens has negative focal power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The third lens has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens has negative focal power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is concave. The fifth lens has positive focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens has positive focal power, the object side surface S11 of the sixth lens is concave, and the image side surface S12 of the sixth lens is convex. The seventh lens has negative focal power, the object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is concave. The eighth lens has negative power, the object side surface S15 of the eighth lens is a concave surface, and the image side surface S16 of the eighth lens is a concave surface. Among them, S17 and S18 (not shown in the figure) in Table 4 can be the object side surface and image side surface of the filter or protective glass, S19 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture, and the aperture is located on the first lens.

[0124] Table 4 shows the basic structural parameters of the optical lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0125]

[0126]

[0127] Table 4

[0128] Table 5 shows the basic structural parameters of the optical lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0129] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -5.3048E-04 -5.9223E-03 6.0861E-03 -4.4147E-03 1.9471E-03 -5.3656E-04 8.8975E-05 -8.0101E-06 2.9891E-07 S2 -9.7284E-04 -4.0446E-03 2.6279E-03 -1.8742E-03 8.8521E-04 -2.8914E-04 6.0410E-05 -6.8984E-06 3.2181E-07 S3 1.2235E-01 -8.4085E-02 5.5358E-02 -2.6536E-02 8.8117E-03 -1.9656E-03 2.8330E-04 -2.4053E-05 9.1974E-07 S4 9.3785E-02 -6.2877E-02 3.9439E-02 -1.7081E-02 4.8143E-03 -8.2735E-04 7.6980E-05 -2.8059E-06 -1.9159E-08 S5 -2.5568E-02 3.7803E-03 1.1931E-03 -1.4914E-03 5.9094E-04 -1.2321E-04 1.4346E-05 -8.7484E-07 2.1490E-08 S6 -4.3429E-02 1.5141E-02 2.2665E-03 -5.0024E-03 2.2658E-03 -5.2692E-04 6.8679E-05 -4.7596E-06 1.3668E-07 S7 1.0105E-02 -8.5968E-03 1.3112E-02 -9.2470E-03 3.5085E-03 -7.7488E-04 9.9565E-05 -6.8988E-06 1.9944E-07 S8 4.0904E-02 -1.6452E-02 3.7738E-03 -2.3226E-04 -1.5892E-04 5.6050E-05 -8.6306E-06 6.6800E-07 -2.0956E-08 S9 3.1273E-03 -1.4292E-03 3.2551E-04 -3.3396E-06 -6.7427E-06 -9.5057E-07 5.2932E-07 -6.1198E-08 2.2825E-09 S10 5.1522E-03 -3.6498E-03 2.1463E-03 -1.0646E-03 3.5044E-04 -7.1374E-05 8.5455E-06 -5.4588E-07 1.4288E-08 S11 3.1364E-02 -6.9285E-03 -1.2474E-03 1.0385E-03 -3.1511E-04 5.7871E-05 -6.4647E-06 3.9788E-07 -1.0255E-08 S12 4.0170E-02 -8.7756E-03 -1.1598E-03 1.0801E-03 -2.9908E-04 4.8195E-05 -4.6107E-06 2.3764E-07 -5.0410E-09 S13 -2.4685E-02 1.8259E-02 -1.0704E-02 3.0768E-03 -4.5945E-04 3.3327E-05 -5.5343E-07 -6.1760E-08 2.6157E-09 S14 -1.0870E-01 5.9348E-02 -1.8078E-02 3.3966E-03 -4.0874E-04 3.1306E-05 -1.4643E-06 3.7880E-08 -4.1284E-10 S15 -8.5717E-02 4.8930E-02 -1.3782E-02 2.2669E-03 -2.3169E-04 1.4978E-05 -5.9778E-07 1.3438E-08 -1.2938E-10 S16 -5.5517E-03 2.1159E-03 -1.1064E-03 2.7035E-04 -3.8641E-05 3.4457E-06 -1.8655E-07 5.5604E-09 -6.9608E-11

[0130] Table 5

[0131] Fig.12 The magnification chromatic aberration curve of the optical lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Fig.13 The axial chromatic aberration curve of the optical lens of the second embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the optical lens. Fig.14 The astigmatism curve of the optical lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.15 The distortion curve of the optical lens of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different image heights.

[0132] Embodiment 3

[0133] like Figures 16 to 22 As shown, the optical lens of embodiment 3 is described. Fig.16 The structure diagram of the optical lens of Example 3-1 is shown. Fig.17 FIG. 3 is a schematic diagram showing the structure of the optical lens of Example 3-2. Fig.18 A schematic structural diagram of the optical lens of Example 3-3 is shown.

[0134] like Figures 16 to 18 As shown, the optical lens includes a lens barrel, eight lenses and a plurality of spacer elements. The lens barrel includes a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, an eighth lens E8 and an eighth spacer element P8, which are arranged in sequence from the object side to the image side.

[0135] like Fig.16 3-1. The structure diagram of the optical lens of embodiment 3-1 is shown in FIG. In this example, the object side surface S1 of the first lens contacts the lens barrel portion. The object side surface and the image side surface of the first spacer element contact the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and the image side surface of the second spacer element contact the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and image side surface of the third spacer element are in partial contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, the object side surface and image side surface of the fourth spacer element are in partial contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, the object side surface and image side surface of the fifth spacer element are in partial contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, the object side surface and image side surface of the sixth spacer element are in partial contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens respectively, the object side surface and image side surface of the seventh spacer element are in partial contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens respectively, and the image side surface S16 of the eighth lens is in partial contact with the object side surface of the eighth spacer element.

[0136] like Fig.17 FIG. 3 is a schematic diagram of the structure of the optical lens of Example 3-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0137] like Fig.18, which is a schematic diagram of the structure of the optical lens of Example 3-3. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0138] In summary, the structural parameters of the optical lens of Example 3 in Example 3-1, Example 3-2, and Example 3-3 are shown in Table 9.

[0139] In the third embodiment, the first lens has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens has negative focal power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The third lens has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens has negative focal power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex. The fifth lens has positive focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens has negative focal power, the object side surface S11 of the sixth lens is concave, and the image side surface S12 of the sixth lens is convex. The seventh lens has negative focal power, the object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is concave. The eighth lens has positive power, the object side surface S15 of the eighth lens is a concave surface, and the image side surface S16 of the eighth lens is a convex surface. Among them, S17 and S18 (not shown in the figure) in Table 6 can be the object side surface and image side surface of the filter or protective glass, S19 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object distance, STO (not shown in the figure) is the aperture, and the aperture is located on the first lens.

[0140] Table 6 shows the basic structural parameters of the optical lens of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0141]

[0142]

[0143] Table 6

[0144] Table 7 shows the basic structural parameters of the optical lens of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0145] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.1863E-03 -2.7510E-03 2.8417E-03 -2.3552E-03 1.1322E-03 -3.3229E-04 5.7807E-05 -5.4057E-06 2.0845E-07 S2 -2.6771E-04 -3.3699E-03 3.0286E-03 -2.7226E-03 1.4589E-03 -4.8796E-04 9.8167E-05 -1.0674E-05 4.7847E-07 S3 8.2314E-02 -5.3307E-02 3.5402E-02 -1.7679E-02 6.1465E-03 -1.4366E-03 2.1667E-04 -1.9160E-05 7.5457E-07 S4 5.0658E-02 -2.8468E-02 1.6943E-02 -6.8652E-03 1.6934E-03 -2.1576E-04 6.1478E-06 1.3602E-06 -1.0322E-07 S5 -2.8281E-02 1.1030E-02 -4.4832E-03 1.3258E-03 -2.7814E-04 4.0091E-05 -3.7604E-06 2.0658E-07 -5.0451E-09 S6 -2.7162E-02 6.9514E-03 3.5643E-06 -6.9346E-04 2.4443E-04 -4.3901E-05 4.5807E-06 -2.6401E-07 6.5082E-09 S7 6.3869E-02 -3.9257E-02 1.8175E-02 -5.8855E-03 1.3030E-03 -1.9433E-04 1.8721E-05 -1.0496E-06 2.5878E-08 S8 8.6202E-02 -4.2214E-02 1.4386E-02 -3.4000E-03 5.4387E-04 -5.7187E-05 3.7181E-06 -1.3137E-07 1.8217E-09 S9 1.8911E-03 -5.7128E-04 -8.2283E-04 6.3383E-04 -2.0152E-04 3.5603E-05 -3.6191E-06 1.9710E-07 -4.4439E-09 S10 3.8727E-02 -2.1420E-02 6.6241E-03 -1.0455E-03 5.4062E-05 6.7962E-06 -1.1890E-06 6.6210E-08 -1.3002E-09 S11 1.4022E-01 -7.9981E-02 2.9964E-02 -7.2876E-03 1.1805E-03 -1.2924E-04 9.2249E-06 -3.8425E-07 7.0018E-09 S12 1.0755E-01 -4.9024E-02 1.4747E-02 -2.8920E-03 3.7553E-04 -3.2390E-05 1.7993E-06 -5.8535E-08 8.4756E-10 S13 -3.7824E-02 3.8021E-02 -1.6541E-02 3.7453E-03 -4.9966E-04 4.1150E-05 -2.0676E-06 5.8274E-08 -7.0707E-10 S14 -1.5038E-01 9.8917E-02 -3.5286E-02 7.4730E-03 -9.8959E-04 8.2886E-05 -4.2668E-06 1.2314E-07 -1.5241E-09 S15 -9.4348E-02 5.3389E-02 -1.7879E-02 3.7552E-03 -4.9981E-04 4.1943E-05 -2.1463E-06 6.1081E-08 -7.4036E-10 S16 3.3392E-02 -1.6414E-02 3.9500E-03 -5.8732E-04 5.6817E-05 -3.5825E-06 1.4195E-07 -3.2043E-09 3.1364E-11

[0146] Table 7

[0147] Fig.19 The magnification chromatic aberration curve of the optical lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Fig. 20 The axial chromatic aberration curve of the optical lens of the third embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the optical lens. Fig.21 The astigmatism curve of the optical lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig. 22 The distortion curve of the optical lens of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights.

[0148] In summary, the optical lenses of Embodiments 1 to 3 respectively satisfy the relationship shown in Table 8.

[0149] Conditional / Example 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 L / ∑AT 2.75 2.75 2.76 2.53 2.54 2.54 3.12 3.11 3.11 f2 / T12 -19.89 -19.89 -19.89 -19.31 -19.31 -19.31 -16.02 -16.02 -16.02 d1m / EP12 4.07 4.06 4.34 5.82 7.00 6.68 4.42 4.64 4.37 (D2m-d2s) / (D1m-d1s) 2.22 2.11 2.31 1.25 1.24 1.22 0.89 0.93 0.87 CT5 / (EP45+CP5) 1.12 1.14 1.10 1.34 1.34 1.29 3.37 3.37 3.15 d7s / (R13+R14) 0.31 0.31 0.31 0.61 0.61 0.61 -2.69 -2.70 -2.69 d0m / f8 -1.28 -1.28 -1.30 -1.38 -1.39 -1.40 0.07 0.07 0.07 f4 / EP34 -4.90 -4.90 -4.90 -7.68 -7.41 -7.48 -5.93 -5.85 -6.30 (d4m+d5s) / f5 1.79 1.80 1.82 1.78 1.79 1.80 3.09 3.09 3.09 d1s / (D0s-d0s) 2.90 2.90 2.90 2.31 2.31 2.31 3.68 1.43 2.45 f3 / (EP23+CT3) 2.50 2.50 2.43 2.99 2.85 2.95 2.02 2.02 1.97 EP78 / (D8s-d8s) 2.21 2.53 1.91 2.24 2.33 2.16 2.31 2.13 2.35 ∑EP / EP34 4.95 4.95 4.95 5.66 5.47 5.52 4.90 4.86 5.26 D5s / R10 -1.21 -1.22 -1.24 -1.22 -1.23 -1.24 -2.40 -2.94 -2.97 d6s / R12 -0.94 -0.95 -0.94 -1.97 -1.97 -1.96 -2.86 -2.86 -2.84 (D3s-d3s) / EP23 1.75 4.92 4.77 2.14 2.00 2.31 1.62 1.81 1.75 f78 / (D7s-d7s) -4.45 -4.32 -3.89 -1.63 -1.61 -1.55 -2.38 -2.28 -2.21 f1*N1 / d1s 8.99 9.01 9.01 6.59 6.61 6.61 7.34 7.36 7.36

[0150] Table 8

[0151] Table 9 shows some parameters of the optical lenses of Examples 1 to 3 (unit: mm, FOV unit: °).

[0152]

[0153]

[0154] Table 9

[0155] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens described above.

[0156] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0157] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0158] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0159] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical lens, characterized in that: The invention comprises a lens barrel and a lens group and a spacer element group assembled in the lens barrel. The lens group is composed of eight lenses, and the lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence from the object side to the image side along the optical axis, and the second lens has a negative optical power; The spacer element group includes at least a first spacer element and a second spacer element, the first spacer element is located between the first lens and the second lens and contacts the image side surface of the first lens, and the second spacer element is located between the second lens and the third lens and contacts the image side surface of the second lens; The maximum height L of the lens barrel and the sum ∑AT of the air intervals between any two adjacent lenses in the lens group on the optical axis satisfy the following: 2.53≤L / ∑AT≤3.12; The effective focal length f2 of the second lens and the air interval T12 between the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02; An inner diameter d1m of the image-side surface of the first spacer element and a spacing distance EP12 between the image-side surface of the first spacer element and the object-side surface of the second spacer element in the optical axis direction satisfy the following: 4.06≤d1m / EP12≤7.

0.

2. The optical lens according to claim 1, characterized in that: The inner diameter d1s of the object side surface of the first spacing element, the outer diameter D1m of the image side surface of the first spacing element, the inner diameter d2s of the object side surface of the second spacing element, and the outer diameter D2m of the image side surface of the second spacing element satisfy: 0.87≤(D2m-d2s) / (D1m-d1s)≤2.

31.

3. The optical lens according to claim 1, characterized in that: The inner diameter d0m of the image side end surface of the lens barrel and the effective focal length f8 of the eighth lens satisfy the following relationship: -1.40≤d0m / f8≤0.

07.

4. The optical lens according to claim 1, characterized in that: The inner diameter d1s of the object side surface of the first spacing element, the outer diameter D0s of the object side end surface of the lens barrel, and the inner diameter d0s of the object side end surface of the lens barrel satisfy the following relationship: 1.43≤d1s / (D0s-d0s)≤3.

68.

5. The optical lens according to claim 1, characterized in that: The image side surface of the fifth lens is a convex surface, and the spacer element group also includes a fifth spacer element, which is located between the fifth lens and the sixth lens and partially contacts the image side surface of the fifth lens, and the outer diameter D5s of the object side surface of the fifth spacer element and the curvature radius R10 of the image side surface of the fifth lens satisfy: -2.97≤D5s / R10≤-1.

21.

6. The optical lens according to claim 1, characterized in that: The third lens has positive optical power, and the spacer element group further includes a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and contacts with the image side portion of the second lens, the third spacer element is located between the third lens and the fourth lens and contacts with the image side portion of the third lens, and the spacing distance EP23 between the image side portion of the second spacer element and the object side portion of the third spacer element in the direction of the optical axis, the effective focal length f3 of the third lens, and the center thickness CT3 of the third lens on the optical axis satisfy the following: 1.97≤f3 / (EP23+CT3)≤2.

99.

7. The optical lens according to claim 1, characterized in that: The spacer element group also includes a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and contacts the image side portion of the second lens, the third spacer element is located between the third lens and the fourth lens and contacts the image side portion of the third lens, and the spacing distance EP23 between the image side portion of the second spacer element and the object side portion of the third spacer element in the direction of the optical axis, the outer diameter D3s of the object side portion of the third spacer element, and the inner diameter d3s of the object side portion of the third spacer element satisfy the following: 1.62≤(D3s-d3s) / EP23≤4.

92.

8. The optical lens according to claim 1, characterized in that: The fourth lens has negative optical power, and the spacer element group also includes a third spacer element and a fourth spacer element. The third spacer element is located between the third lens and the fourth lens and contacts with the image side surface of the third lens. The fourth spacer element is located between the fourth lens and the fifth lens and contacts with the image side surface of the fourth lens. The spacing distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element in the optical axis direction and the effective focal length f4 of the fourth lens satisfy: -7.68≤f4 / EP34≤-4.

90.

9. The optical lens according to claim 1, characterized in that: The spacer element group also includes a third spacer element and a fourth spacer element, the third spacer element is located between the third lens and the fourth lens and contacts the image side portion of the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and contacts the image side portion of the fourth lens, the spacing distance EP34 between the image side portion of the third spacer element and the object side portion of the fourth spacer element in the direction of the optical axis, and the sum ∑EP of the spacing distances between the object side end face of the lens barrel and any two adjacent optical elements in the spacer element group on the optical axis satisfy the following: 4.86≤∑EP / EP34≤5.

66.

10. The optical lens according to any one of claims 1 to 9, characterized in that: The spacer element group also includes a fourth spacer element and a fifth spacer element. The fourth spacer element is located between the fourth lens and the fifth lens and contacts the image side portion of the fourth lens. The fifth spacer element is located between the fifth lens and the sixth lens and contacts the image side portion of the fifth lens. The spacing distance EP45 between the image side portion of the fourth spacer element and the object side portion of the fifth spacer element in the direction of the optical axis, the center thickness CT5 of the fifth lens on the optical axis, and the thickness CP5 of the fifth spacer element in the direction of the optical axis satisfy the following: 1.10≤CT5 / (EP45+CP5)≤3.37.

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